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people-talkingU.S. National Work Group (USNWG)

The USNWG works to promote, encourage, and participate in the establishment of a comprehensive set of legal metrology standards for commercial measurement of hydrogen for vehicle and other refueling applications including (1) device design, accuracy, installation, and use requirements; (2) method of sale requirements; (3) test procedures; and (4) fuel quality standards. The ultimate goal is that these standards will ensure the accuracy of measurements, enhance consumer protection, foster fair competition, and facilitate economic growth and trade.

The USNWG works through in-person meetings, conference calls, and email. The USNWG is currently accomplishing its goals through two subcommittees; one will work to simultaneously develop equipment standards and test procedures and a second will develop fuel specification requirements.

Next Meeting(s): TBD
Meeting Summary(s):
October 3-4, 2007, USNWG Meeting, Gaithersburg, MD
March 4-6, 2008, USNWG Meeting, West Sacramento, CA
June 17-19, 2008, USNWG Meeting, Des Plaines, IL
August 26-27, 2008, USNWG Meeting, Allentown, PA
December 2-4, 2008, USNWG Meeting, Boulder, CO
January 30, 2009, USNWG Meeting, Tele/Web Conference
February 24, 2009, USNWG Meeting, Tele/Web Conference
April 28-30, 2009 USNWG Meeting, West Sacramento, CA
June 17, 2009 USNWG Meeting, Tele/Web Conference
July 7, 2009 USNWG Meeting, Tele/Web Conference
August 11-13, 2009 USNWG Meeting, Gaithersburg, MD
"The Starting Point: A Discussion Paper Describing a Proposed Method of Sale and Quality Specification for Hydrogen Vehicle Fuel" (August, 2009)
December 15, 2009 USNWG, Tele/Web Conference
January 13, 2010 USNWG, Tele/Web Conference
April 27, 2010 USNWG, Tele/Web Conference
May 25, 2010 USNWG, Tele/Web Conference
June 17, 2010 USNWG, Tele/Web Conference
October 12, 2011, USNWG Meeting, Tele/Web Conference
Meeting Agenda(s):
July 2, 2010 USNWG Meeting, Tele/Web Conference
April 19, 2011 USNWG Meeting, Tele/Web Conference
June 15, 2016 USNWG Meeting, Tele/Web Conference
Latest Code(s):
2016 NIST Handbook 44 Hydrogen Gas Measuring Devices Tentative Code
2016 NIST Handbook 130 Hydrogen Method of Sale Regulation
2016 NIST Handbook 130 Hydrogen Fuel Quality Regulation and Related Definitions



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Of Interest

The 101st National Conference on Weights and Measures (NCWM) Annual Meeting met July 23-28, 2016 in Denver, CO. Two proposals to modify NIST Handbook 44 Section 3.39 Hydrogen Gas-Measuring Devices-Tentative Code on the NCWM Specifications and Tolerances (S&T) Committee agenda were adopted. The hydrogen gas devices code will be modified to recognize that required information on sealable metrological parameters may also be made available in an electronic format on Category 3 devices. A modified version of S&T Item 339-2 widens the current hydrogen code accuracy tolerances of 1.5 % acceptance to 5.0 % and the current maintenance tolerance of 2.0 % to 7.0 %. The code will have only one accuracy class designated as Accuracy Class 7.0. The adopted changes to the hydrogen code will appear in the 2017 edition of NIST Handbook 44.